The US Geological Survey reported a strong magnitude 7.2 earthquake off Papua New Guinea on Thursday,
This is the fourth quake in the area in the past week coming just two days after a 7.4-magnitude jolt shook the southern coast.
The quake hit 90 miles south-west of the town of Arawa and was relatively shallow at six miles.
There are no reports of damage or casualties, Reuters says.
The Pacific Tsunami Warning Center said hazardous tsunami waves were possible within 185 miles of the epicenter on the coasts of the Solomon Islands and Papua New Guinea.